Storage unit



FIG. 1 is a top plan view of a storage unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view as seen when in use, the right side being a mirror image thereof; and,

FIG. 4 is a front perspective view thereof. 

The ornamental design for a storage unit, as shown and described. 